I went to the cinema on last Sunday with my 2 daughters (10 and 11 years) to watch, as for theirs request (sigh !), the thai movie "Ruk-Kong-Rao /The moment":  I would to avoid to mention the very low level of the movie (?), but I will not avoid to mention that there was several scenes showing teen-agers lighting up a sigarette, and smoking, without any sign of censorship: any consideration ?

Why do you think that censorship is the answer ?
who decides what to censor ?
is it ok to show people drinking alcohol,dancing provocatively,pointing guns,jumping out of aircraft ?
as a responsible adult couldn't you just advise the kids that the things shown in movies is not always real/safe or advisable to copy.

Thats not the point. Of course I advise my kids, and I am against of any kind of censorship too. The point is that the censorship exist here ( alcohol, guns and sigarettes are "blurred" in every movies I see in tv) but not in that case. Strange.